This book deals with the kinetics of phenomena that are important in reaction engineering: reaction kinetics, both "homogenous"-in a single phase- and "heterogeneous" involving a gas and a liquid or solid phase. The mechanism of the reactions has been accounted for in greater detail than previously, in an effort to be more realistic, but also more reliable in their kinetic modeling e.g., in thermal cracking, polymerization, hydrocarbon processing and bio-processes.